Strong higher-order resonant contributions to x-ray line polarization in hot plasmas.
Strong higher-order resonant contributions to x-ray line polarization in hot plasmas.
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DOI：
10.1103/physreve.93.061201
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
C. Shah;P. Amaro;R. Steinbrügge;C. Beilmann;S. Bernitt;S. Fritzsche;A. Surzhykov;José R. Crespo López-Urrutia-Jos
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文献类型：
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作者：
C. Shah;P. Amaro;R. Steinbrügge;C. Beilmann;S. Bernitt;S. Fritzsche;A. Surzhykov;José R. Crespo López-Urrutia-Jos
我们研究了高电荷铁和氪离子共振复合中x射线的角分布，分辨了双电子、三电子和四电子通道。一个可调谐的电子束驱动这些过程，产生x射线，由沿和垂直于电子束轴安装的两个探测器记录。测量到的发射不对称全面地作为全阶原子计算的基准。我们得出结论，只有在包含高阶过程的前提下才能获得热等离子体的精确极化诊断，而这些过程在以前的工作中被忽略了。
We studied angular distributions of x rays emitted in resonant recombination of highly charged iron and krypton ions, resolving dielectronic, trielectronic, and quadruelectronic channels. A tunable electron beam drove these processes, inducing x rays registered by two detectors mounted along and perpendicular to the beam axis. The measured emission asymmetries comprehensively benchmarked full-order atomic calculations. We conclude that accurate polarization diagnostics of hot plasmas can only be obtained under the premise of inclusion of higher-order processes that were neglected in earlier work.